Boiler.



No. 737,903. PATBNTED SEPT.- 1, 1903.

- s. T. J. BRAY BOILER.

APPLIOATIONTILED MAR. 30. 1903.

N0 MODEL. 2 SHEETS-SHEET, 1

m: mums Pmsns co, worn-mun. wxwmc-wu. o c

PATENTED SEPT. 1, 1903. S. T. J. BRAY.

BOILER.

APPLICATION FILED MAR. 30. 1903.

2 SHEETS-SHEET 2.

NO MODEL.

Iatented September-1, 1905;.

PATENT. OFFICE.

STEPHEN TIIOS."'JAMES BRAY, OF MOSCOYV, RUSSIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 737,903, dated September 1, 1903.

Application filed March 30,1903- .l'o a whom, it nuty concern:

Be it known that I, STEPHEN THOMAS JAMES BRAY, a British subject, residing at Moscow, Russia, have invented certain new and useful Improvements in Boilers, of which the following is a specification, reference being had therein to the accompanying drawings, which form a part thereof.

My invention relates to steam-b0ilers, and more particularly to that class of fire-tube boilers provided with auxiliary circulating water-tubes situated within the fire-box.

The object of the invention is to provide a boiler of this class wherein the auxiliary watertubes are independent of each other and detachable and so constructed and arranged as to be applicable to the ordinary type of boiler as now in general use without requiring material alterations therein, wherein the heating area willbe increased by the extent of surfaces of said pipeswithout obstructing the fire-tubes or fire-grate or reducing the ordinary heating area of the fire-box, wherein said auxiliary tubes are so arranged as to prevent accumulation of scale between them and the fire-box walls, and wherein said tubes may be readily cleansed of the scale accumulation therein.

The invention consists in the novel features of construction hereinafter set forth and described, and more particularly pointed out in the claim hereto appended.

Referring to the drawings, Figure 1 is a sectional side elevation of a locomotive-boiler, showing the application of my auxiliary circulating water-tubes thereto. Fig. 2 is a side elevation of one of the said tubes, partly broken away to disclose the means of securing a tight fit and the arrangement of the means for removing the scale from same; and Fig. 3 is a front elevation of one of said pipes.

Like letters refer to like parts throughout the several views.

In the drawings I have shown the invention as applied to the ordinary type of locomotive, in whichais the boiler, a the fire-tubes therein, and b the fire-box. The general arrangement and construction of these parts is that ordinarily found in boilers of this type in general use, the walls I) of the fire-box I) being reinforced by the stay-bolts c and a suitable space being provided in the usual manner between the inner and outer walls of the fire-box.

Serial No. 150.157. (No model.)

A plurality of independent auxiliary circulatingwater-pipes are disposed about the walls 1), within the fire-box Z), said pipes being proj ected Within the fire-box free of said walls to permit access of the flames and heat to all portions thereof and of the side walls I), so as to insure as great an increase of the heating area as possible without decreasing the heat ing-surface of the fire-box walls and to minimize the accumulation of exterior scale between said pipes and the fire-box walls. Each of said pipes comprises a straightway portion (Z and elbows (Z and (Z at the opposite ends thereof, respectively. The upper elbow (Z is longer than the lower (Z in order to project the upper portion of the pipes well within the heating area of the flame and heat, while preventing the lower portion thereof from so overhanging the fire-grate (not shown) as to obstruct the draft or otherwise interfere with the fire. These pipes are arranged vertically about the fire-box and to insure a more oven temperature of the water adjacent to the firebox are of a suflicient length to place the waterspace near the bottom of the fire-box in communication with that portion thereof as near the top of the fire-box as is practicable. The elbows d (Z are respectively provided with flanges (1 having bolt-holes therein adapted to aline with the stay-bolt holes in the fire-box walls I) adjacent thereto, whereby the said pipes may be connected to the firebox by using the ordinary stay-bolts necessary thereto, the length of which, however, being sufficient to compensate for the increased thickness due to the flange (1 The tubes are applied by cutting suitable openings in the walls I) of the ordinary fire-box in the proper relation to the stay-bolts to be used in securing them in position, and a j oinder of these parts is effected by forming gasket-seats in the face of the walls 1) adjacent to the said openings and in the flanges d and fitting a metallic ring it therebet-ween. This ring it is ground into the seats so provided with fine emery or other abrasive substance to insure a perfectly tight joint.

To facilitate the cleansing of the scale from the inside of the auxiliary circulating-pipes, I provide each end of each pipe with openings f, which respectively aline with the straightwayportion (l and the elbows d and 01 These openings are interiorly screwthreaded and are closed by means of screwthreaded plugs g g g 9 provided with suitable means for facilitating their application and removal.

The operation of the heretofore-described boiler, which has not already been described, is as follows The auxiliary circulating waterpipes having been applied in the manner as specified the water at the lowest temperature adjacent to the bottom of the fire-box b flows upward thereto,t ough, and is heated therein and discharged in o the upper portion thereof, thus raising the temperature of this portion of the water contained in the boiler and insuring a more even temperature of the water in this entire portion of the boiler. These pipes are projected well into the fire-box, so-

as to be acted on throughout their entire surface by the heat and flames and yet the rest of the fire-box walls I) are acted upon by the heat in substantially the same manner and degree as before the application of said pipes. As heretofore stated, the pipes do not so overhang the fire-gra-te as to interfere with the fire in any way. If when washing out the boiler it is desired to clean these auxiliary pipes, it is merely necessary to remove the plugs g g and g or 9 which permits ready access to all portions of these pipes. WVhen a thorough inspection of these pipes is required or when it becomes necessary to replace a defective pipe, any pipe, as desired, may be quickly removed and replaced by simply removing and replacing the stayboltnuts, securing it in position without interfering with the remaining pipes in any manner or cutting away any portion of the head plate or walls of the fire-box.

The size of the auxiliary pipes is dependent solely upon the size of boiler and conditions under which it is to be used, and said pipes may be of any desired material, although for obvious reasons it is desirable to have them of the same material as the fire-box of the boiler.

It is not my intention to limit the invention to the precise construction herein shown and-described, as it is apparent that the details of construction may be varied without departing from the spirit and scope of my invention.

Having described the invention, what I claim as new, and desire to have protected by Letters Patent, is-

The combination with a boiler and a firebox therefor, of a plurality of vertically-disposed auxiliary circulating water-pipes communicating respectively with the upper and lower portions of the interior of said boiler, said pipes respectively comprising a vertical section and elbows at each end, and means in connection with said elbows whereby the said pipes are independently secured in relation to said fire-box walls, said upper elbow being of greater length than the lower elbow.

In witness. whereof I have hereunto afiixed my signature, this 2d day of March, 1903, in the presence of two witnesses.

STEPHEN THOSpJAMES BRAY. 

